Stability analysis of upset recovery methods for electromagnetic interference [flight control systems]

In this paper a recently developed analytical tool is explained and used to determine the effect on stability of standard error recovery systems on a model of a Boeing 737 used for research at the NASA Langley Research Center. In particular, this paper analyzes the effect of error recovery rollback, reset, and cold restart systems in a digital flight controller subject to transient upsets induced by high intensity electromagnetic interference (EMI) or lightning. Different recovery methodologies are compared by determining the maximum frequency of transient upsets that maintains mean-square stability of the flight control system.